⊙﹏☉ = What flusters the character - for Avestrus!
It’s been a long time since Avestrus has been actually flustered--although it used to happen often with particular individuals when he was Decimus.
For something like that, there needs to be some advancement of his character, I think. He basically has to stop discounting 99% of what people say. True, deep connections with people, however? Moments of affection, expressions of love, etc (if he believes them) would likely do the trick. There’s a distinct sort of gentleness and reassurance that he requires (and doesn’t allow himself) and would not really know how to handle. That would probably fluster him.
For now, he either arrogantly acts like he deserves that kind of thing or brushes it aside because of a lack of belief.